Which tidal pattern has two high tides and two low tides each day?
a: mixed
b: diurnal
c: semidiurnal
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The right option is; C: Semidiurnal

Semidiurnal tide is one of the three basic tidal patterns that take place along the earth’s major shorelines. Semidiurnal tide is a pattern in which two high tides and two low tides are about the same height. If there is difference between the heights of two high and two low tides, the pattern is known as a mixed semidiurnal tide. Most areas (such as the U.S. East Coast) usually have two high tides and two low tides each day.

the answer to your question is:

c. complementary base-pairing